If anyone else has a problem with a loose charging connector on T500... It looks like the T500 DC-in jack isn't mounted on a PCB, but is on a cable with a connector, and the jack is held in place wrt the chassis partly with a screw. So it might've just been the whole jack part wiggling within the chassis, and just needed a little tightening. Or just needed an $8 eBay part swapped in without soldering. Those old ThinkPad models had "Hardware Maintenance Manuals" ("HMM") PDFs that IBM/Lenovo freely shared, with step-by-step instructions for disassembly and reassembly. (Though I understand sending a new unit back, and also not wanting to possibly void warranty.)